JPH0730620A - Cordless phone - Google Patents

Abstract

(57) [Summary] [Purpose] When a cordless phone is designed to charge the cordless handset by returning the cordless handset to the cordless handset, when a specific cordless handset and the cordless handset are mutually connected by a wireless line. The necessary identification number for mutual confirmation can be set through the wireless line instead of through the charging terminal. [Structure] When the charging detection means B detects that the child device HSU is placed on the parent device BU and charging is started, in response to this, the signal transmission means C registers in advance in the registration means A. The registration signal including the identification number etc. is transmitted. When the signal receiving means D receives this registration signal, the identification number included in the signal is registered in the registration means E. In response to this registration, the signal returning means F sends a confirmation signal to notify the completion of registration, and a common identification number is mutually set and registered between the specific slave unit HSU and the specific master unit BU. I did it.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cordless telephone which charges a slave unit by returning the slave unit to the master unit.

[0002]

2. Description of the Related Art Generally, some cordless telephones include a base unit as a master unit and a handset unit as a portable slave unit. In this type of cordless telephone, when making a call to an outside line using a handset unit, a call is made via the base unit. In that case, it is necessary to connect a wireless line only between a specific base unit and a specific handset unit so as not to cause interference with other cordless telephones.

Further, the handset unit is provided with a secondary battery therein to secure a power source so that it can be used cordlessly with respect to the base unit, and after a certain period of use, the handset unit is used as a base unit. There is one that allows the secondary battery to be charged by returning to.

By the way, as described above, in order to connect a wireless line between a specific handset unit and a specific base unit, it is necessary to match the communication channels between them. Further, if only the call channels are matched, there is a risk of eavesdropping when there is another telephone having the same call channel.
A common identification number is mutually registered between a specific handset unit and a specific base unit, this common identification number is checked during a call, and this common There is one that enables a call between a base unit having an identification number and a handset unit.

In order to mutually register a common identification number between a specific base unit and a handset unit,
Memory is required for both the base unit and the handset unit.
If you are using a volatile memory such as RAM and forget to return this handset unit to the base unit and leave it for a long time, the secondary battery will be discharged and you must register it first. It may happen that the data of the identification number you put in is lost.

Therefore, in the conventional cordless telephone,
When the handset unit is returned to the base unit to charge the secondary battery, a common identification number is mutually registered through the charging terminal.

[0007]

However, as in the conventional case, in order to register the common identification number of the handset unit and the base unit, if they are carried out through the charging terminals of both, the base unit side, for example, Is an output circuit for generating and transmitting an identification number signal, and an extraction circuit for determining the presence or absence of a signal including an identification number input through a charging terminal on the handset unit side and extracting the signal. Are required separately,
The circuit configuration becomes complicated.

In order to solve the above problems, the present invention provides
To enable registration of a common identification number for mutual confirmation, which is necessary when connecting a specific slave unit and master unit to each other via a wireless line, through a normal wireless line without using the charging terminal. It is an issue.

[0009]

In order to solve the above-mentioned problems, the present invention adopts the following configuration in a cordless telephone in which the slave unit is charged by returning the slave unit to the master unit.

That is, in the cordless telephone according to the present invention, one of the slave unit and the master unit has a registration means in which a preset identification number is registered, and the slave unit is placed on the master unit. Charging detection means for detecting that charging has started, and signal transmission for transmitting a registration signal including an identification number or the like registered in advance in the registration means based on the detection output from the charging detection means. And a registration means for registering a signal receiving means for receiving a signal from the signal transmitting means and an identification number included in the signal received by the signal receiving means. Means and
When the identification number or the like is registered by the registration means, there is provided a signal returning means for returning a confirmation signal including the identification number or the like in response to the registration.

[0011]

In the above structure, when the charging detection means detects that the child device is placed on the parent device and charging is started, in response to this, the signal transmission means registers in advance in the registration means. A registration signal including an identification number is transmitted.

When the signal receiving means receives the registration signal, the identification number included in the signal is registered in the registration means. In response to this registration, the signal returning means sends a confirmation signal to notify the completion of registration.

As a result, a common identification number is mutually set and registered between a specific slave unit and a specific master unit, so that during a call, the master unit and the slave unit having this common identification number The wireless line can be connected only between the two.

[0014]

1 is a functional block diagram showing the overall configuration of a cordless telephone according to an embodiment of the present invention.

In the figure, BU is a base unit as a master unit and HSU is a handset unit as a slave unit. As will be described later in detail, both BU and HSU communicate wirelessly, and the handset unit. HSU
Is returned to the base unit BU, the handset unit HSU is charged.

The base unit BU has a registration means A in which a preset identification number is registered, a charge detection means B for detecting that the handset unit HSU is placed on the base unit BU and charging is started, Further, it includes a signal transmitting means C for transmitting a signal for registration including an identification number or the like registered in advance in the registration means A based on the detection output from the charging detection means B.

On the other hand, the handset unit HSU registers the signal receiving means D for receiving the registration signal from the signal transmitting means C of the base unit BU, the identification number included in the signal received by the signal receiving means D, and the like. And a signal replying means F for returning a confirmation signal including the registered identification number and the like in response to the registration means E for registering the identification number and the like. .

FIG. 2 is a block diagram showing a concrete structure of the base unit BU as a master unit.

In the figure, 101 is an antenna for radio transmission / reception, 102 is a filter for separating a high frequency reception signal and a transmission signal, and 103 is a reception circuit system for amplifying and detecting the reception signal. The receiving circuit system 3 includes a receiving amplifier, an intermediate frequency / detection circuit, and the like. A telephone line interface 104 is connected to a telephone line and exchanges two lines for telephone calls and four lines for receiving and transmitting.

Reference numeral 105 is a transmission amplifier at the final stage for supplying a transmission signal to the antenna 101, and 106 is a transmission amplifier 10.
5. An amplifier power supply on / off circuit for turning on / off the power supply to 5, a transmission circuit system 107 for controlling the modulation of a transmission signal into a high frequency signal, switching of transmission / non-transmission, secret code modulation, etc.
Reference numeral 08 is a PLL circuit for enabling a so-called MCA method that automatically selects a channel with less interference from the available channel group.

MCb is a microcomputer, 109 is a PLL control means for controlling the PLL circuit 108 to determine the transmission / reception frequency, 110 is a received data detection means for reading the data signal output from the receiving circuit system 103, Reference numeral 111 denotes a transmission data transmission means for transmitting transmission data to the handset unit shown in FIG.
This transmission data is modulated in the transmission circuit system 107.

Reference numeral 112 denotes an amplifier power supply on / off circuit 106.
An amplifier power supply control means 113 for controlling the data, a data discrimination means 113 for discriminating whether or not there is data corresponding to a preset identification number in the reception data taken in by the reception data detection means 110, and 114 is a data discrimination. Memory read / write means for storing the identification number in the memory 116 when the means 113 determines that the identification number is present, and for reading the identification number stored in the memory 116 as necessary, Reference numeral 115 is a charge detection unit that detects when the handset unit is returned to the base unit and charging is started.

Further, 117 is a power supply circuit, 118 is an AC adapter for receiving power from a commercial power supply, 119 is a charging circuit, and 120 is a charging terminal for supplying a charging current to the handset unit of FIG.

When the configuration of FIG. 2 is associated with that of FIG. 1, the memory 116 is registered in the registration unit A and the charge detection unit 115 is registered.
Corresponds to the charge detection means B, and the transmission data transmission means 111, the transmission circuit system 107, and the transmission amplifier 105 correspond to the signal transmission means C, respectively.

FIG. 3 is a block diagram showing a specific configuration of the handset unit HSU as a slave.

In the figure, reference numeral 1 is an antenna for radio transmission / reception, 2 is a filter for separating a high frequency reception signal and a transmission signal, 3 is a reception amplifier for amplifying the reception signal, and 4 is an intermediate for the reception signal. An intermediate frequency / detection circuit 5 for detecting after setting the frequency is a PLL circuit for enabling a so-called MCA method for automatically selecting a channel with less interference from the available channel group.

Further, 6 is a squelch circuit for detecting the strength of radio waves, and 7 is a low frequency circuit for converting the detection output of the intermediate frequency / detection circuit 4 into a voice signal.
A secret demodulation circuit and an expander circuit (not shown) are included if necessary.

Reference numeral 8 is a received data demodulator for demodulating signals of identification numbers and various operation commands included in the received signal, and 9
Is a speaker amplifier, and 10 is a receiving speaker.

Reference numeral 11 is a transmission amplifier at the final stage for supplying a transmission signal to the antenna 1, and reference numeral 12 is a transmission circuit / VC for generating a high frequency transmission signal in combination with the PLL circuit 5.
O and 13 are low-frequency circuits for amplifying the voice signal from the microphone 16 for transmission, and the low-frequency circuit 13 includes a secret-talk modulation circuit as needed.

Reference numeral 14 indicates that the power to the transmission amplifier 11 is turned on.
Amplifier power supply on / off circuit for turning off, 15 is a transmission power supply on / off circuit for turning on / off the power supply to the entire transmission system, 1
6 is a microphone for transmission.

MCh is a microcomputer, 17 is a PLL control means for controlling the PLL circuit 5 to determine the transmission / reception frequency, and 18 is a received data detection means for reading the data signal output from the received data demodulator 8. , 19 are transmission data transmission means for transmitting data for transmission to the base unit, and the transmission data is modulated in the transmission circuit 12.

Reference numeral 20 denotes Kerch detection means for detecting the presence or absence of the output of the squelch circuit 6, 21 is amplifier power supply control means for controlling the amplifier power supply on / off circuit 14, and 22 is for controlling the operation of the transmission power supply on / off circuit 15. The transmission power control means 23 is a data discriminating means 24 for discriminating whether or not the data detected by the reception data detecting means 18 includes data corresponding to a preset identification number.
Is a memory means for storing the identification number when the data discrimination means 23 determines that the identification number is present, 25
Is a charge detection unit that detects when the handset unit is returned to the base unit and charging is started.

Reference numeral 26 is a charging circuit, 27 is a charging terminal for receiving power supply by connection with a charging terminal 114 of a base unit, which will be described later, and 28 is a rechargeable battery.

When the configuration of FIG. 3 corresponds to that of FIG. 1, the receiving amplifier 3, the intermediate frequency / detection circuit 4, the received data demodulator 8 and the received data detecting means 18 are provided to the signal receiving means D and the data receiving means D. The discrimination means 23 and the memory means 24 are registered in the registration means E, the transmission data transmission means 19, the transmission circuit / V.
The CO 12 and the transmission amplifier 11 correspond to the signal returning means F, respectively.

Next, the operation of the cordless telephone having the above configuration will be described with reference to FIGS.

Now, in order to charge the handset unit HSU, when the handset unit HSU is placed on the base unit BU, the charging terminals 27 and 120 of both BU and HSU are connected to each other and charging is started. .
Then, the charge detecting means 25, 11 of both BU and HSU
5 detects that the handset unit HSU has returned onto the base unit BU.

The detection output of the charge detection means 115 in the base unit BU is the memory read / write means 1
4, the PLL control means 109, and the amplifier power supply control means 112, respectively. In response to the detection output, the memory read / write means 14 reads together the respective data of the identification number stored in the memory 116 and the call channel number to be used, and the transmission circuit system via the transmission data transmission means 111. To 107. On the other hand, the PLL control means 109 responds to the detection output from the charge detection means 115 in accordance with the PLL circuit 10.
8, the transmission circuit system 107 generates a registration signal including an identification number and a communication channel number in a predetermined communication channel corresponding to the previous communication channel number, and sends the registration signal to the transmission amplifier 105. At this time, the amplifier power supply control means 112 selects the off state of the amplifier power supply on / off circuit 106, so that the transmission amplifier 105 does not perform transmission with normal power, but occurs in the transmission circuit system 107. The weak registration signal is wirelessly transmitted to the handset unit HSU via the transmission amplifier 105, the filter 102, and the antenna 101.

However, since the base unit BU and the handset unit HSU are close to each other,
Even weak radio waves can be sufficiently received by the antenna 1 of the handset unit HSU. in this way,
If it is a weak radio wave, it will be
This is convenient because it reduces the possibility of adversely affecting the surroundings.

On the handset unit HSU side, when the transmission signal from the base unit BU is received, this signal is input to the intermediate frequency / detection circuit 4 via the filter 2 and the reception amplifier 3. At this time, the PLL control means 17 controls the PLL circuit 5 to sequentially switch the channels of the signals received by the intermediate frequency / detection circuit 4 one by one to search for a radio wave from the base unit BU. Then, if there is a received signal of the corresponding communication channel, this is sent to the received data demodulator 8.

The received data demodulator 8 demodulates the signal of the identification number, the communication channel, and other various operation commands included in the received signal, and outputs this to the received data detecting means 18. The reception data detecting means 18 reads the input reception data and judges whether or not there is data of an identification number or a call channel number of a predetermined format,
If there is such data, it is transferred to the data discriminating means 23. When the charge detection unit 25 detects the charge, the data determination unit 23 determines that the identification number and the call channel number included in the received data are correct and stores them in the memory unit 24. Store.
As a result, the old data already stored in the memory means 24 is rewritten with the new data received this time.

After that, the handset unit HSU side sends the identification number and the call channel number received by the transmission data sending means 19 in order to inform the base unit BU that the identification number and the call channel number have been registered. Since the same data is sent to the transmission circuit / VCO 12, this data is modulated to the frequency of the speech channel and given to the transmission amplifier 11. At this time, the transmission power supply ON / OFF circuit 15 is in the ON state,
Since the amplifier power supply on / off circuit 14 is selected in the off state by the amplifier power supply control means 21, the transmission amplifier 11 does not perform transmission with normal power, and a weak signal generated by the transmission circuit / VCO 12 is generated. Will be wirelessly transmitted to the base unit BU via the transmission amplifier 11, the filter 2, and the antenna 1.

However, also in this case, since the base unit BU and the handset unit HSU are located close to each other, the base unit BU is sufficiently satisfactorily used even for weak radio waves.
It is possible to receive with the antenna 101.

When the base unit BU side receives a signal from the handset unit HSU, this signal is input to the filter 102 and the receiving circuit system 103. At this time, the PLL control means 109 causes the PLL circuit 10
8 to control the channels of the signal received by the receiving circuit system 103 one by one to sequentially switch the base unit BU.
Search for radio waves from. Then, if there is a received signal of the corresponding communication channel, this is demodulated and sent to the received data detecting means 110. The reception data detecting means 110 is
With respect to the received data, it is judged whether or not there is data of an identification number or a call channel number of a predetermined format, and if there is such data, this is transferred to the data discriminating means 113. The data discriminating means 113 stores the received identification number, call channel number, and memory 11 first.
The identification number and the call channel number registered in 6 are compared with each other. If they match, the communication is stopped and the telephone is in a waiting state.

If both data discriminated by the data discriminating means 113 do not match, the above-mentioned data transmission from the base unit BU is repeated again in the same manner as described above.

After that, when making a call to an outside line by using the handset unit HSU, both HSUs having the same identification number under the call channel pre-registered with the above base unit BU. , BU is bidirectionally communicated.

In the above embodiment, the base unit BU side sends a signal including the identification number to the handset unit HSU side, and the handset unit HSU registers the identification number. Conversely, it is also possible to send a signal including the identification number from the handset unit HSU side and register the common identification number on the base unit side.

[0047]

According to the present invention, in a cordless telephone in which the slave unit is returned to the master unit to charge the slave unit, the specific slave unit and the master unit are connected to each other via a wireless line. In this case, since the identification number for mutual confirmation, which is required in some cases, can be performed through the wireless line without performing through the charging terminal, the circuit configuration becomes simpler than before and the cost can be reduced.

[Brief description of drawings]

FIG. 1 is a functional block diagram showing an overall configuration of a cordless telephone according to an embodiment of the present invention.

FIG. 2 is a block diagram showing a specific configuration of a base unit BU as a master unit.

FIG. 3 is a block diagram showing a specific configuration of a handset unit HSU as a child device.

[Explanation of symbols]

BU ... Parent unit (base unit), HSU ... Slave unit (handset unit), A ... Registering means, B ... Charge detecting means, C
... Signal transmitting means, D ... Signal receiving means, E ... Registering means, F
... Signal return means.

Claims (1)

[Claims] 1. A cordless telephone configured to charge a slave unit by returning the slave unit to the master unit, wherein one of the slave unit and the master unit has a preset identification number registered therein. The registration means, the charging detection means for detecting that the slave unit is placed on the master unit and charging is started, and based on the detection output from the charging detection means, it is registered in advance in the registration means. A signal transmitting means for transmitting a registration signal including an identification number and the like, and the other one of the slave unit and the master unit is a signal receiving means for receiving a signal from the signal transmitting means, and the signal Registration means for registering the identification number or the like included in the signal received by the receiving means, and, in the case where the identification number or the like is registered by this registration means, in response to this, a confirmation signal including the identification number or the like is sent. A signal reply means for replying, Cordless telephone, characterized in that.